Ore-roasting furnace



(No Model.)

H. P. HOLLAND. ORE ROASTING PURNAGE.

No. 5444761. Patented Aug. 20; 1895.

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UNITED STATES PATENT OEEICEo HENRY P. HOLLAND, OF SAN FRANCISCO,CALIFORNIA.

ORE-ROASTING FU RNACE.

SPECIFICATION forming part of Letters Patent No. 544,761, dated August20, 1895.

Application tiled November 13, 1893. Serial No. 490,854. (No model.)

To all whom it may concern.-

Be it known that I, HENRY P. HOLLAND, of San Francisco, county of SanFrancisco, and State of California, have invented a certain new anduseful Improvement in Ore-Roasting Furnaces--viz., an upright blastingore-roasting furnace-of which the following is a specification.

My invention relates to improvements in blasting ore-roasting furnaces,the same being constructed in an uprightposition, having thefuel-charger of said furnace introduced through an opening inthe top soconstructed that it may be tightly closed by a stopper or plug fittingIinto said aperture, said furnace being provided with a pipe enteringthe firebox at the top for feeding oil as fuel to the furnace-fires,having also an ore-feeder at one side of the fuel-charger through which`the ore is fed into the upper end of a worm-shaped roaster constructedfrom the top to the bottom' of the furnace, circling aroundthe Wall ofthe re-box on its outside, having hot air and flame-tuyeres entering itfrom said fire-box, slanting downward into the same, through which uesand through one entering the mouth of the worm hot compressed air andflame are forced into the worm for roasting and carrying the ore insuspension through the same to an ore-receiver connected with saidfurnace, the fine particles of ore being lifted and carried by thewhirling force of the compressed air. The fumes and smoke are conductedfrom the receiver into fa Water-tank, from whence they escape as gasthrough an airescape pipe into the open air. Compressed air is conductedby a pipe leading from an air-receiver and air-compressor to the top ofthe furnace, where it enters the air-chamber, which is the space formedbetween the wall of the furnace and the wall of the fire-box andextending under the bottom of the fire-box, where are located thetuyere-holes opening into said fire-box, and through which thecompressed air in the chamberis forced into and upon the fire for thepurpose of intensifying the ame, and also for forcing hot compressed airand flame through the air and flame tuyeres into the worm for roastingand conveying the ore in suspension through the worm into the receiver.The ore from the ore-feeder is conducted into the upper end of thewormgbyits passage to the mouth of the worm.

The object of my invention is to provide an upright ore-roasting furnaceby means of which ore may be speedily moved and roasted while insuspension, beingoperated by means of compressed air. A great heat isproduced by the tuyeres in the bottom of the tire-box, and as the hotcompressed air and ame are forced through the ues into the Worm the oreis roasted in a few seconds While being carried in suspension through ittothe receiver. I attain these objects by the-mechanism illustrated bythe following drawings. y

Figure 1 is an elevation of the ore-furnace,

.showing its connection with the ore-receiver and water-tank; Fig. 2,asection through the ore-furnace, showing the threaded worm around thefire-box, air-chamber between walls and under the fire-box, also thevfuelcharger, ore-feeder, and air-tuyeres; Fig. 3, a horizontal sectionthrough the ore-furnace, showing the air-chamber between Walls, thetuyeres, and mouth of Worm, the ore-feeder, the threaded worm, thetuyere-ues entering the worm, and the tuyeres in the floor of thefire-box; Fig. 4, a section of the threaded worm, showing thetuyere-flues.

A represents .the furnace; B, the brickwork; C, the worm, threaded,through which the ore is conveyed and roasted while in suspension; D,iron casing about the ore-furnace; a, ore-feeder; b, revolving screwregulating ore-feed; c, ore-aperture of worm; d, fuel-charger; e,stopper or plugclosing fuelcharger; f, lift or handle to stopper; g,pipe conducting compressed air to air-chamber between the walls of thefurnace; h,.pipe conducting hot compressed air into the upper end meansof a revolving screw-shaped regulator operated by controlling the supplyof ore in of the worm; i, worm-discharge; lo, air-chamber infurnace-walls; l, door at bottom ofthe furnace; H, ore-receiver; I,water-tank; m, discharge-pipe carrying ore, when roasted, from the worminto the receiver; n, ore-discharge door from the receiver; 0 gas-escapepipe; p, pipe connecting ore-receiver with water-tank, conveying smokeand gas fumes into water-tank; fr, faucet for drawing off water from thetank; s s s, fire and name flues through which flame and hot air areforced into the Worm; tt, tuyeres in the oor of the ICJO furnace,through which compressed air is forced into the fire; u, pipe forfeeding oil when used for fuel upon the fire; L, re-box of the furnace.

What I claim as my invention, and. desire to secure by Letters Patent ofthe United States, is

l. An upright blasting ore roasting furnace consisting of the fire boxL., the fuel charger d. and u. the latter for feeding oil as fuel to thefire box, the stopper or plug e. for closing the mouth of the charger,(having lift or handle f.) the worm C, in which the ore is roasted whilebeing carried in suspension through it by means of compressed hot airand flame forced therein; the ore aperture o., the ore feeder a., therevolving screw b., regulating the ore feed as it passes from the feederto the ore aperture of the Worm, the pipe g. conducting compressed airto the air chamber k. between the walls and extending under the furnacefrom whence the air is forced through the tuyeres in the bottom of firebox; the pipe 7L. conducting hot compressed air to the ore aperture ofthe worm c, for carrying the ore in suspension and forcing it throughthe worm to the receiver, the flues s. s. s. through which'hotcompressed air and flame are forced into the sides of the worm forconveying and roasting the ore in suspension in its passage to thereceiver, the worm discharge fi., the

Vpipe m., conveying the roasted ore from the worm discharge into thereceiver, the ore receiver II., the door n. through which the roastedore may be discharged from the receiver, the pipe'p. connecting the orereceiver with water tank conveying the smoke and the fumes coming fromthe furnace fires and the roasting ore, into the water tank, the watertank I. by means of which the furnace gases are washed or purified, thegas escape pipe o., conveying the gases from the water tank into theopen air; and the tuyeres f. t. in the floor of the fire box,substantially as herein de scribed and set forth.

2. In an upright blasting roasting furnace, the combination of the worm,C; the ore aperture of vsaid worm, c; the fire and flame flues, s s s,entering the lower portions of the worm, for conveyinginto it flame andcompressed hot air, for moving and roasting the ore which is carried insuspension by the compressed hot air; the ore feeder, a', for conveyingore to the ore aperture of the worm c; the revolving screw, b, forregulating the ore feed in its passage from the ore feeder to the oreaperture of the worm; andthe oil feeding fuel pipe, u, for carrying oilto the fire-box; with the pipe, g, for conveying compressed air to theair chamber about the re box; the tuyeres, f t, in the bottom of therebox through which compressed air is forced into the fire box; thefirebox, L; the fuel charger, CZ, in the top of the furnace; the plug orstopper, e, for fuel charger, d, having handle,f,' the pipe, h, forconveying hot compressed air into the mouth of the worm; the airchamber, 7c, arranged between the walls 544,rei

said tank for conducting the gases therefrom, y

substantially as herein described and set forth.

3. In an upright blasting ore roasting furnace, the combination of thepipe, g, for conducting compressed air from the air compressor tothe airchamber5the air chamber, c,between the walls of the furnace about theflrebox; the tuyeres, t 1f, beneath the firebox, through whichcompressed air from the air chamber is forced into the i'irebox; thefirebox, L; the fuel charger, cl, in the top of the furnace; and the oilfeeding fuel pipe, u; the plug or stopper, e, for fuel charger, d,having handle, f; with the ore feeder, ct, for conveying ore to the oreaperture of the worm; the revolving screw, b, for regulating the orefeed in its passage from the ore feeder to the ore aperture of the worm;the worm, C, through which the ore is carried in suspension by the hotcompressed air forced into it; the mouth of the worm, c, at the entranceto the worm; the pipe, h, conducting hot compressed air into the mouthof the worm; the fire and flame flues, s 3 s, entering the lower part ofthe worm for conveying into it flame and compressed hot air for movingand roasting the ore which is carried in suspensiomby the compressed airto the receiver; the worm discharge, z'; the pipe, m, conducting theroasted ore from the Worm to the receiver; the ore receiver, I-I, forreceiving the roasted ore; the discharge, n; the pipe, p, for conveyingthe fumes and smoke into the water tank for purifying the same; theWater tank, I, and the gas escape, o, in said tank, for conducting thegases therefrom-substantially as herein described and set forth.

et. In an upright blasting ore roasting furnace, the combination of theWorm, C, having ore aperture, c; the discharge, 1'; the pipe, m, forconducting the roasted .ore from the worm to the receiver; the fuelcharger, cl; the oil feeding fuel pipe, u; the plug or stopper, e, forfuel charger, CZ, having handle, f; the pipe, h, for conveying hotcompressed air into the mouth of the worm,'c; the ore feeder, a; andrevolving screw, b, for conducting and regulating ore feed invitspassageto the worm; the compressed air pipe, g, for conducting compressed airfrom the air compressor to air chamber; the tuyeres, t t, in the bottomof the fire b'ox through which compressed air is forced into the firebox; the fire box, L; the air and flame flues, s s s, entering the lowerportions of the worm for conveying into it flame and compressed hot air;the air chamber, 7c, arranged between the walls of the fur IOO IIS

vnace and the re-box5 the ore receiver, H; the

discharge, n; the pipe, p, for conveying the fumes and gases into theWater tank; the

Water tank, I, in which the gases and smoke are purified; and the gasescape, o, in said. tank for conducting the gases therefrom,-substantially as herein described and set forth.

5. In an upright blasting ore roasting furnace, the combination of there box, L, having fuel charger, d; and the oil feeding fuel pipe, u; theplug or stopper, e having handle, f; with the compressed air pipe, g,for conducting compressed air from air compressor to the air chamber;the tuyeres, tt, in the bottom of the fire box through which compressedair is forced into the rebox; the air chamber, 7a, arranged between .theWalls of the" furnace and under the fire boX; the air and llame-compressed air forced into it; the discharge,

i; the pipe, m, at the end of the Worm for delivering the roasted oreinto the receiver; the ore receiver, H, into which the roasted ore isdischarged; the discharge, n, in the ore receiver; the pipe, p, forconveying the fumes and smoke linto the water tank; the Water tank, I,and the gas escape, o, in said tank, for conducting the gases-therefronnr-substantially as herein described and set forth.

, HENRY P. HOLLAND.

Witnesses:

GEORGE SENN, M. D. HOWELL.

